An implantable neurostimulator device for implantation in a head of a patient includes a housing adapted to be implanted beneath a patient's scalp, a cardiac monitoring element, a therapy module, and a processor. The processor is configured to activate the therapy module to deliver a therapeutic output to treat a neurological event upon detection of a cardiac event in a cardiac signal. In some embodiments, the device may comprise a brain monitoring element. In some embodiments, the processor may be configured to receive and monitor a brain signal from the brain monitoring element and change the therapeutic output based upon the brain signal.